Malicious PDF — malware analysis report

Static analysis result for SHA-256 a961a6f42842a59a…

MALICIOUS

PDF

90.4 KB Created: 2021-04-09 10:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ffdf1be6287014a1b88cc4b552e7cd13 SHA-1: c3f38967424e09c876021b260542244d3eb9a9d4 SHA-256: a961a6f42842a59a09c02e64c270d394db4b58bf2a56f13ac32981b260b174bc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=graphic+design+degree+essay PDF link annotation
    • https://zobupasig.weebly.com/uploads/1/3/1/4/131438120/kabajaziz-joverosun-basotiv.pdfIn PDF document text
    • http://melapotu.22web.org/v_for_vendetta_quotes_v_introduces_himself.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/dDfijhb/toolbar_template_kendo_grid_mvc.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/hdNt9gd/ayyappa_swamy_telugu_dj_naa_songs.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/8a99fdf93.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/fafovubudukelewisumopida02ds8.pdfIn PDF document text
    • https://texejuzaw.weebly.com/uploads/1/3/0/7/130775796/kizavawoxiga-zenisimonifi.pdfIn PDF document text
    • http://zavudonalu.66ghz.com/xonaladitomaz.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/b9d859c19d4c996.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/9567874.pdfIn PDF document text
    • http://xazutakivad.iblogger.org/43281833983.pdfIn PDF document text
    • http://autobaff.xyz/how_to_program_new_xfinity_remote_xr15ui0zn.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/QLjhjAJ/82710718095.pdfIn PDF document text
    • http://esclub.pro/nc_learners_permit_test_study_guidewmmy1.pdfIn PDF document text
    • https://sarofosifuzatu.weebly.com/uploads/1/3/5/3/135329924/4683c.pdfIn PDF document text
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/8966718dc2c1529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wulagisi/lodinelumorixumusisaruk.pdfIn PDF document text
    • http://sirowozikuko.epizy.com/11586538617.pdfIn PDF document text
    • http://sofidubanelen.epizy.com/car_game_pc_windows_7_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/how_to_use_edu_science_telescope_50-600.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/acting_for_animators.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 5436 bytes
SHA-256: aa5d02d9582fae1ca47d62861c2616669b3b94eb0b00f67a07bb2b567573eec1
font_01_sfnt_off000137e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E1 10820 bytes
SHA-256: 9800022a8738654c60e0598d6e975094511452d054f7429bdf582023ef5cc8bb